/*
 * Java CMPP API
 * Copyright (C) 1998 - 2002 by Xu Youming
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * A copy of the LGPL can be viewed at http://www.gnu.org/copyleft/lesser.html
 * Java CMPP API author: xuym@bc-info.net
 * Java CMPP API Homepage: http://cmppapi.sourceforge.net/
 * $Id: ASCIIEncoding.java,v 1.1 2008/03/19 02:56:56 xym Exp $
 */

package com.bci.cmpp.util;

/**
 * Encoding class representing the ASCII (IA5) alphabet encoding.
 */
public class ASCIIEncoding extends com.bci.cmpp.util.AlphabetEncoding {
	private static final int DCS = 1;

	private static final ASCIIEncoding instance = new ASCIIEncoding();

	/**
	 * Construct a new ASCIIEncoding.
	 */
	public ASCIIEncoding() {
		super(DCS);
	}

	/**
	 * Get the singleton instance of ASCIIEncoding.
	 */
	public static ASCIIEncoding getInstance() {
		return (instance);
	}

	/**
	 * Decode SMS message text to a Java String. The SMS message is expected to
	 * be in ASCII format.
	 */
	public String decodeString(byte[] b) {
		if (b == null)
			return ("");

		try {
			return (new String(b, "US-ASCII"));
		}
		catch (java.io.UnsupportedEncodingException x) {
			return ("");
		}
	}

	/**
	 * Encode a Java String to bytes using the ASCII encoding.
	 */
	public byte[] encodeString(String s) {
		if (s == null)
			return (new byte[0]);

		try {
			return (s.getBytes("US-ASCII"));
		}
		catch (java.io.UnsupportedEncodingException x) {
			return (new byte[0]);
		}
	}
}